Multigraphing attachment



Inventor;

mum HS/zerrod, I f

. Attorney. I

Aug. 4, 1925,.

w. H. SHERROD MULTIGRAPHING ATTACHMENT Filed Nov. 15, 192.3

I objects. disclosed,

. handled.

UNITED STATES PATENT OFFICE.

WILLIAM n. snnnnon, or LOS ANGELES, camron'ma.

mumrcnarnrnc ATTACHMENT.

Application filed November 15, 1923. Serial No, 674,891.

To all whom it may concern: v

Be it known that I, WILLIAM H. SHERROD, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Multigraphing Attachment,

'of which a specification is set forthbelow.

In this specification, and the accompanying drawing, I shall describe and show a preferred form of my invention, and specifically mention certain of its more important I do not limit myself to the forms since various changes and adaptationsmay ing from the essence of my invention as hereinafte1 claimed; and objects and advantages, other than those specifically mentioned, are included within its scope.

My invention relates to multigraphing means for use with writing machines and hasfor its salient object the production of aplurality of copies of the original writing, each one of which is practically identical and indistinguishable from the original. A further object is to rovide a simple device for accomplishing t e above purpose that may readily be attached to standard writing machines of many types.

It is well known that in duplicating typewriting by the use of carbon papers, as has hitherto been the custom, the copies have an appearance quite different na, and are readily distinguishable therefrom. This difference in appearance chiefly due to. the difference in texture in the ink carriers used for producingthe original and duplicates, and to the characteristics of the'inks used in the preparation of these respective articles. The dissimilarity is often very objectionable, as in the preparation of form letters where the superscription is filled in after the body of the letter is written. Furthermore the characteristics of the inks employed for carbon papers make neat erasures very difiicult or impossible, and there is a tendenc for the writing of carbon copies to smu makes use of rib- The present inventionand these ribbons bone for multigraphing,

are of the same texture and inked in the same manner as the ribbon employed for v he original writing. There is onl one essential difference between the mu tigraphing ribbons and the original ribbon and that is" that the former areinked on one be made therein without departfrom the orig-igo when side only, to prevent a reverse impression being made on the back of the overlying sheetof paper.

In the embodiment .of my invention selected for illustrative purposes, as shown in j the accompanying draw1ng,-.

Figure 1 is a perspective view of a characteristic form of ty ewriting machine with my device applie :thereto. The type- .writer itself forms no part of my invention and therefore no attempt has been made in this figure to correctly represent its struc-f' tural details;

Figure 2 is an enlarged perspective view of the end portion of the platen roll of such a machine, with my device located in proper cooperative relation thereto;

Figure 3' is a transverse elevational section of certain of the parts shown in Fig. 2; an

Figure 4 is a front elevation of a portion of these same selected parts.

Similar reference numerals refer to similar parts throughout the several views.

In practically every standard typewriter there is a longitudinal bar 5 on the carriage, slightly above and to the rear of the platen roll 6. In cases where such a bar is not present it is. usually a comparativel simple matter to put one in. At each en bar I attach a hinge clip 7 This is conveniently made in the form ofan inverted U, and may be fastened to the bar by means of a set screw 8.

Each of the bin a plurality of rib thereto by means of a hinge pin 9. number of these ribbon carriers in each case e clips is provided with is the same as the number'of the multibifurcated, as indicated most plainly in Fig.

4, and the bifurcated extremities are bent around the pin to form eyes for the hinge joint. This construction permits therein of this 1 2 four such carriers,

on, carrier strip hinged The i there is only one such carrier stri 10 riers to be interlocked in assemblin in such" a manner that they may lie close y superosed 'and s'li 'htly 'overlappingwhen In use.-

nv Fig; 4am e carriers'e xcept 10 havebeen brokena'way from theirbifurcated eye ends,

and the numerals indicate how the interlocking is accomplished. The arrangement permits such carriers as are not in use to be swung upward about pin 9, out of the way.

Each carrier carries a small ribbon spool 14 at its lower end. These are shown mounted in such a manner that their angular adjustment is maintained by friction. The edges of the spools may be knurled or fluted if desired, as at 15, to aid in their adjustment. A ratchet device may be employed for maintaining the adjustment if it should be thought to be desirable.

The corresponding carrier strips at the respective ends of the machine are used in pairs, and suitable ribbons 16 are stretched between them by adjusting spools 14:. The outer sides of these ribbons are not inked, as previously explained, and the impact of the type bars serves to produce an impression only on the paper beneath the ribbons. The ribbon carriers and ribbons, of course, move with the carriage supporting the platen.

It will be obvious that, if the duplicating ribbons are of the same texture, and are inked in the same manner with the same ink as the main ribbon of the machine, the multigraphedcopies will be practically identical, and indistinguishable from the orig inal.

I claim as my invention:

1. A writing machine having multigraphing means comprising; strips hinged to the platen carriage at each end of the platen, and carrying ribbon spools at their free ends; and impression ribbons on said spools stretched between said strips parallel to the platen between the sheets to be multigraphed; said ribbons being inked on one side only.

multigra-phed; said spools being adapted for rotation to vary the exposed portions of said ribbons; and said ribbons being inked on one side only.

3. In a writing machine multigraphing means comprising strips hinged to the platen carriage at each end of the platen and carrying ribbon spools at their, free ends; and ink ribbons on said spools stretched between said strips parallel to the platen between the sheets to be multigraphed.

4. In a. writing machine multigraphing means com rising in combination strips hinged to tide platen carriage at each end of the platen and carrying ribbon spools at their free ends; and ink ribbons on said spools stretched between said strips parallel to the platen between the sheets to be multigraphed; said spools being adapted for rotation to vary the exposed portions of said ribbons.

5. In a writing machine multigraphing means comprising in combination strips hinged to the platen carriage at each end of the platen and carrying ribbon spools at their free ends; and ink ribbons on said spools stretched between said strips parallel to the platen between the sheets to be multigraphed; said spools being adapted for rotation to vary the exposed portions of said ribbons and with means for maintaining their rotative positions with respect to said strips.

WILLIAM H. SHERROD. 

